采用固定冲程的柱塞泵，省去复杂的机械冲程调节装置，使柱塞直接推动膜片工作。
Adopting piston pump with fixed stroke, the piston directly propels the diaphragm, thus deleting the complex mechanic stroke adjustment equipment.
另外它比电机驱动的冲程长度调节成本要低的多。
In addition it is motor-driven than the stroke length adjustment of costs to many low.
在泵头松动之后，取下泵头之前，调节冲程长度到0%位置。
At loose pump head, the pump head removed prior to adjusting the length of the 0% stroke position.
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